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UI Text Box
sizemedium
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The Edit Condition window is at the core of the Phoenix Particle Tuner. It consists of a Conditions Tree on the left and a Parameters panel for the individual elements in the tree on the right. The Delete Particle, Change Particle Channel or Affect By Forcesactions will only be executed for the particles of the Simulator which satisfy the conditions tree.

The Conditions Tree is made up of the following expression types: Logic, Compare, Math, Value.

Folding (collapsing) of a tree item in the view to the left will show you a simplified view of the expression. For example, collapsing the tree in the image below will change its text to "Age > 1.000", meaning the Particle Tuner will affect only particles whose Age channel is higher than 1 second. You can also read a simplified view of the entire condition expression in the text box below the Edit Condition... button.


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Section

Value Expression Item

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valueExpression
valueExpression

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The Value Expression Item is the lowest level operator. It expects no sub-expressions but can be converted to a Math Expression Item by selecting it with the right mouse button in the Conditions Tree.

The Value Expression Item returns a raw number which can be either the value of a Particle Channel or a Texture for a given particle of the Phoenix Simulator, a manually-specified number in a certain range or the distance between a given particle and an object in the scene.



Number | val_type, val_number – returns the specified value.

Random Between | val_type, val_rand_min, val_rand_max – returns a random number in the selected range. Note: a different value is generated for each particle of the Simulator. The value also changes for every frame.

Channel | val_type, val_chan_part – returns the value of the specified Simulator Particle Channel for the current particle. You must have this particle channel enabled in the Output rollout of your Simulator. The Channel can be one of:[ Size ], [ Age ], [ Viscosity ], [ RGB Red ], [ RGB Green ], [ RGB Blue ], [ Velocity X ], [ Velocity Y ], [ Velocity Z ], [ Speed ]. You can find out more about the usual particle channel ranges in Phoenix here.

Distance To | val_type, val_dist_node – returns the distance from the current particle to the surface of the specified object. Will be positive if the particle is outside the object volume, and will be negative if the particle is inside the object volume. The distance is in simulation grid voxels. Note: currently you can only pick polygon meshes - measuring distance from the current particle to a nearest particle from a particle system is currently not supported.

Texture | val_type, val_tex – returns the specified texture's color intensity in the position of the current particle. The Phoenix Simulator has no Explicit UV coordinates therefore the texture's Mapping should be set to Planar from Object or World XYZ for this to work.

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